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A compact shorted-stub on-chip filter is presented in this paper. All the stubs and line sections of the 3 ^rd order filter were meandered in order to miniaturize the overall size of the filter. Realized using microstrip lines on the top-layer of a 0.18 um CMOS, the overall filter circuit covers a surface area of 1.288 mm by 0.992 mm. The center frequency of the filter is 25 GHz, with an insertion loss of 10 dB at 48 % bandwidth. The layout, simulation results and measurement results are shown in the paper.